Experimental Study on the Mechanical Properties and Microstructural Mechanisms of Coal Gangue-Based Cementitious Materials Synergistically Activated by Desulfurization Gypsum and Lime.

Luyao Wang, Qingping Wang, Jingyi Cai, Feifei Zhou, Zhiwei Cheng, Jiayao Zhang

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Article in Polymers, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Luyao WangSchool of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.

Qingping WangSchool of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.

Jingyi CaiSchool of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.

Feifei ZhouSchool of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.

Zhiwei ChengSchool of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.

Jiayao ZhangSchool of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.

Funding

National Major Scientific Research Instrument Development Project No. 52227901The University Synergy Innovation Program of Anhui Province GXXT-2023-019

6 · The paper itself

Abstract

Coal gangue and flue gas desulfurization gypsum (DG) are industrial by-products whose utilization is critical for sustainable development. This study explores the synergistic activation of coal gangue using DG and lime to develop eco-friendly cementitious materials. Three systems-CF (coal gangue-DG), CL (coal gangue-lime), and CFL (coal gangue-DG-lime)-were designed to investigate the effects of DG and lime on coal gangue reactivity. Unconfined compressive strength tests identified the optimal dosages of DG and lime, while XRD, SEM, TGA-DTG, and NMR analyses were employed to characterize the hydration products and microstructure. The results demonstrated that calcium ions from both lime and DG facilitated the formation of C-(A)-S-H gel, enhancing strength development. However, excessive DG led to undesirable volume expansion due to ettringite overproduction, compromising material stability. Excess lime forms weak Ca(OH)

Indexed as

activationcementitious materialscoal gangueenvironmentally friendlyflue gas desulfurization gypsumlime

Identifiers

PMID40219320

DOI10.3390/polym17070932

PMCPMC11991633

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LicenceCC BY

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